You will get a lot more people who are familiar with the 215/223 engines if you look at the forum in the link below. Scroll down to vintage sixes and you will find a lot of folks who can answer questions about these engines. https://fordsix.com/index.php?sid=edb7bffd6ee387386586f975cd8170e5
PS....I can also recall in the past some of the members posted solutions to your exhaust control damper problem. They have a search feature similar to fordbarn you can use to find it.